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Lua compiler for windows

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Posted by Nick Gammon   Australia  (23,166 posts)  Bio   Forum Administrator
Date Reply #15 on Tue 22 Jan 2008 01:08 AM (UTC)
Message
Well I don't know about that. I used tcpdump to dump a session using LuaSocket between MUSHclient and my home web server (asking for the root document) and this is what it generated:


GET / HTTP/1.1
host: 10.0.0.2
te: trailers
connection: close, TE
user-agent: LuaSocket 2.0.1


The only problem I can see here is the user-agent, so a custom query using some other agent may well get through.
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Isthiriel   (113 posts)  Bio
Date Reply #16 on Tue 22 Jan 2008 01:46 AM (UTC)

Amended on Tue 22 Jan 2008 02:05 AM (UTC) by Isthiriel

Message
... other than "Host" != "host". Sure.

GET /<query-string> HTTP/1.1
host: api.eve-online.com
fails.

So that's the problem there. LuaSocket isn't generating a Host header. (Which means it's technically not generating a HTTP/1.1 compliant request either. It is, instead, generating a bunch of garbage 'host', 'te' ... headers. And 'user-agent' != 'User-Agent' either.)

Nvm. It turns out that header field names are supposed to be case-insensitive. Which means that, since CCP is a MS shop, the fault probably lies with IIS.
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Posted by Nick Gammon   Australia  (23,166 posts)  Bio   Forum Administrator
Date Reply #17 on Tue 22 Jan 2008 02:37 AM (UTC)

Amended on Wed 23 Jan 2008 05:51 AM (UTC) by Nick Gammon

Message
Well I got it to work in the end, thanks to Isthiriel and my own debugging with Wireshark. :)

If you edit the file http.lua in the "socket" directory under the MUSHclient directory, you will find the spot where they use lower-case header names. Amend the table to capitalize them, and then the request works:


local function adjustheaders(reqt)
    -- default headers
    local lower = {
        ["User-Agent"] = USERAGENT,
        ["Host"] = reqt.host,
        ["Connection"] = "close, TE",
        ["Te"] = "trailers"
    }
    -- if we have authentication information, pass it along
    if reqt.user and reqt.password then
        lower["Authorization"] = 
            "Basic " ..  (mime.b64(reqt.user .. ":" .. reqt.password))
    end
    -- override with user headers
    for i,v in base.pairs(reqt.headers or lower) do
        lower[string.lower(i)] = v
    end
    return lower
end



Edited to change User-agent to User-Agent.
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Nick Gammon   Australia  (23,166 posts)  Bio   Forum Administrator
Date Reply #18 on Tue 22 Jan 2008 02:45 AM (UTC)

Amended on Tue 22 Jan 2008 02:50 AM (UTC) by Nick Gammon

Message
I agree with Isthiriel that they (Eve Online, not Luasocket) have incorrectly implemented the HTTP specification. From RFC 2616 section 4.2 we see:


Each header field consists of a name followed by a colon (":") and the field value. Field names are case-insensitive.


At one stage I got this back from the Eve web site:


<h1>Bad Request (Invalid Header Name)</h1>


A more general solution would be to change (as well) the code I quoted above, where it has this part:


-- override with user headers
    for i,v in base.pairs(reqt.headers or lower) do
        lower[string.lower(i)] = v
    end


Even if you specify your own header, it is forced into lower case, which doesn't help. I initially tried to put a "Host" header into the user-supplied header table.

You would need to change string.lower(i) into a capitalization function. Such a function could be:


function capitalize (s)
  return string.upper (string.sub (s, 1, 1)) .. string.sub (s, 2)
end -- capitalize
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Isthiriel   (113 posts)  Bio
Date Reply #19 on Tue 22 Jan 2008 03:02 AM (UTC)
Message
Canonically, TE and User-Agent shouldn't be first-letter capital, rest lower either.

I've complained about CCP's code monkeys before (on their forums) but in this case I think it almost has to be IIS doing something wrong rather than the ASP written by CCP's web cell.
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Posted by Nick Gammon   Australia  (23,166 posts)  Bio   Forum Administrator
Date Reply #20 on Tue 22 Jan 2008 04:09 AM (UTC)
Message
I think it is slightly annoying that Luasocket uses all lowercase. Although the spec says the case is irrelevant, most of the examples I have seen have had the words capitalized. For example:

http://en.wikipedia.org/wiki/HTTP

And you are right, they show (by example) both words capitalized, as in "Content-Length".

I think there are quite a few programmers that skip reading the specs, and code from examples, and thus they probably thought that a case-sensitive match was OK, and indeed was compatible with most browsers.

The utility Wireshark helped me in my debugging, see here:

http://www.wireshark.org/

This is a GPL utility (that is, free) that analyzes network traffic.
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Metsuro   USA  (389 posts)  Bio
Date Reply #21 on Tue 22 Jan 2008 04:19 AM (UTC)
Message
so by changing the suggested portions you got luasocket to behave correctly? and are saying that even with it behaving correctly you still wouldn't get the expect items from CCP?
Everything turns around in the end
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Posted by Metsuro   USA  (389 posts)  Bio
Date Reply #22 on Tue 22 Jan 2008 04:45 AM (UTC)

Amended on Tue 22 Jan 2008 04:50 AM (UTC) by Metsuro

Message
ok well you know I added the changes... thank you very much by the way... but i couldn't seem to get the information still so i figured it was just not gonna work... but then i tried to access the address again.. and got a loading problem page... so i guess it was just down and then just a moment ago i got what I was looking for so thank you. Now to move on the next step figuring out how to parse the xml... there any good books or reference manuals?
Everything turns around in the end
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Posted by Nick Gammon   Australia  (23,166 posts)  Bio   Forum Administrator
Date Reply #23 on Tue 22 Jan 2008 05:41 AM (UTC)
Message
Well this is your lucky day because MUSHclient has a built-in XML parser (if you want to use it).

This test demonstrates how it can parse the XML into a Lua table:


xml = [[
<?xml version='1.0' encoding='UTF-8'?>
<eveapi version="2">
  <currentTime>2008-01-22 03:35:07</currentTime>
  <result>
    <characterID>1097517373</characterID>
    <name>Nikolai Wolfwood</name>
    <race>Caldari</race>
    <bloodLine>Civire</bloodLine>
    <gender>Male</gender>
    <corporationName>Knights of Minas Tirith</corporationName>
    <corporationID>1696815543</corporationID>
    <balance>102059730.45</balance>
    <attributeEnhancers>
      <willpowerBonus>
        <augmentatorName>Neural Boost - Basic</augmentatorName>
        <augmentatorValue>3</augmentatorValue>
      </willpowerBonus>
      <memoryBonus>
        <augmentatorName>Memory Augmentation - Basic</augmentatorName>
        <augmentatorValue>3</augmentatorValue>
      </memoryBonus>
      <charismaBonus>
        <augmentatorName>Social Adaptation Chip - Basic</augmentatorName>
        <augmentatorValue>3</augmentatorValue>
      </charismaBonus>
      <perceptionBonus>
        <augmentatorName>Ocular Filter - Basic</augmentatorName>
        <augmentatorValue>3</augmentatorValue>
      </perceptionBonus>
      <intelligenceBonus>
        <augmentatorName>Cybernetic Subprocessor - Basic</augmentatorName>
        <augmentatorValue>3</augmentatorValue>
      </intelligenceBonus>
    </attributeEnhancers>
    <attributes>
      <intelligence>7</intelligence>
      <memory>9</memory>
      <charisma>6</charisma>
      <perception>10</perception>
      <willpower>7</willpower>
    </attributes>
    <rowset name="skills" key="typeID" columns="typeID,skillpoints,level,unpublished">
      <row typeID="11584" skillpoints="12" level="0" />
      <row typeID="3427" skillpoints="2829" level="2" />
      <row typeID="3426" skillpoints="8016" level="3" />
      <row typeID="3432" skillpoints="1581" level="1" />
      <row typeID="3551" skillpoints="8000" level="3" />
      <row typeID="3424" skillpoints="90510" level="4" />
      <row typeID="3417" skillpoints="1415" level="2" />
      <row typeID="3413" skillpoints="45255" level="4" />
      <row typeID="21059" skillpoints="2829" level="2" />
      <row typeID="3422" skillpoints="90510" level="4" />
      <row typeID="3416" skillpoints="8000" level="3" />
      <row typeID="3425" skillpoints="16000" level="3" />
      <row typeID="3420" skillpoints="32000" level="3" />
      <row typeID="3300" skillpoints="8000" level="3" />
      <row typeID="3304" skillpoints="4243" level="2" />
      <row typeID="3312" skillpoints="2829" level="2" />
      <row typeID="3310" skillpoints="2829" level="2" />
      <row typeID="3311" skillpoints="2829" level="2" />
      <row typeID="3301" skillpoints="8000" level="3" />
      <row typeID="3318" skillpoints="90510" level="4" />
      <row typeID="3386" skillpoints="250" level="1" />
      <row typeID="3377" skillpoints="45255" level="4" />
      <row typeID="12385" skillpoints="77040" level="3" />
      <row typeID="3378" skillpoints="45255" level="4" />
      <row typeID="3375" skillpoints="45255" level="4" />
      <row typeID="3374" skillpoints="45255" level="4" />
      <row typeID="12376" skillpoints="24000" level="3" />
      <row typeID="3379" skillpoints="41507" level="3" />
      <row typeID="3392" skillpoints="45255" level="4" />
      <row typeID="25863" skillpoints="750" level="1" />
      <row typeID="3323" skillpoints="2829" level="2" />
      <row typeID="12441" skillpoints="512000" level="5" />
      <row typeID="3319" skillpoints="8000" level="3" />
      <row typeID="3320" skillpoints="250" level="1" />
      <row typeID="3321" skillpoints="500" level="1" />
      <row typeID="3450" skillpoints="250" level="1" />
      <row typeID="3449" skillpoints="250" level="1" />
      <row typeID="3455" skillpoints="250" level="1" />
      <row typeID="3411" skillpoints="750" level="1" />
      <row typeID="3402" skillpoints="8000" level="3" />
      <row typeID="3356" skillpoints="2829" level="2" />
      <row typeID="3355" skillpoints="1415" level="2" />
      <row typeID="12099" skillpoints="1500" level="1" />
      <row typeID="3334" skillpoints="64435" level="3" />
      <row typeID="3330" skillpoints="93019" level="4" />
      <row typeID="3342" skillpoints="1000" level="1" />
      <row typeID="12097" skillpoints="500" level="1" />
      <row typeID="3327" skillpoints="45255" level="4" />
    </rowset>
  </result>
  <cachedUntil>2008-01-22 04:35:07</cachedUntil>
</eveapi>
]]

t = assert (utils.xmlread (xml))

require "tprint"
tprint (t)


Now you may not want to use MUSHclient to parse it, I think the Lua manual has an example of an XML parser as well.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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